Involvement of the small GTPase rho in integrin-mediated activation of mitogen-activated protein kinase - PubMed (original) (raw)
. 1996 Sep 6;271(36):21691-4.
doi: 10.1074/jbc.271.36.21691.
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- PMID: 8702960
- DOI: 10.1074/jbc.271.36.21691
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Involvement of the small GTPase rho in integrin-mediated activation of mitogen-activated protein kinase
M W Renshaw et al. J Biol Chem. 1996.
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Abstract
Engagement and clustering of integrins triggers a number of intracellular signaling events, including activation of the mitogen-activated protein (MAP) kinases Erk1 and Erk2. To investigate the mechanism by which integrins mediate the activation of MAP kinases upon binding of NIH 3T3 cells to fibronectin, we assessed the effects of both inhibiting and activating the small GTPase Rho. We observed that inhibition of Rho by the Rho-specific inhibitor C3 exoenzyme or by a dominant negative Rho A (RhoN19) inhibited MAP kinase activation. Conversely, activation of Rho by expression of an activated Rho A mutant (RhoQ63L), or the Rho-specific guanine nucleotide exchange factor lbc, enhanced and partially mimicked activation of Erk2 by plating on fibronectin. These results therefore show that Rho is involved in the integrin-dependent activation of MAP kinase.
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